Collar and lead ring and process of coupling drill-pipes.



H. A. BARDEEN. ISOLLAR AND LEAD RING AND PROCESS OF COUPLING DRILLPIPES.

APPLICATION FILED APR.Z8. I91].

zf//// I 1/ g I nnr orr'ro HUGH A. BARDEEN, OF LOS ANGELES, CALIFORNIA.

, COLLAR AND LEAD RING AND PROCESS OF COUPLING DRILL-PIPES.

Specification of Letters Patent.

Patented May a, 1918.

Application filed April 28, 1917. Serial No. 165,290.

To all whom it may concern.

Be it. known that I, HUGH A. BARDEEN, a citizen of the United States,residing at Los Angeles, in the county of Los Angeles and State ofCalifornia, have invented a new and useful Collar and Lead Ring andProcess of Coupling Drill-Pipes, of which the following is aspecification.

My invention relates to ipes, and is particularly applicable todrillpipe such as is used in the rotary system of drilling oil Wells incommon use in the California and midcontinental oil fields of the UnitedStates. In drilling such oil wells by the rotar systern, a string ofdrill pipe is rotate this string carrying a bit at its lower end. Thevarious joints of pipe are connected at regular intervals by collars, ineither end of which the pipe is threaded. Due to the fact that the pipeis sometimes a little crooked, it is quite common for these collars towear eccentrically, and even where no ec-' centric wear takes place, theWear and destruction of collars is very rapid.

The principal object of my invention is to provide means whereby worncollars may be reconstructed at a nominal cost.

In couplin together the various joints of pipe of a dri ling string,power driven pipe tongs are commonly used. As the pipe is sub ected toexcessive driving strains there is a constant tendency for the pipes toturn deeper into the collars and eventually the ends of the two pipescome together. No further approach between them being possible, whenthis occurs the excessive driving strains tend to burst the collars. Afurther object of my-invention is to provide yieldin means between theends of the pipe insife the collars, so that bursting. of the collars islargely prevented.

Further objects and advantages will be set forth hereinafter.

In the drawings, which are for i1lustrative purposes only:

Figure 1 is a sectional viewof a reconstructed collar and lead ring inplace in a pi e joint.

ig. 2 is a sectional elevation on a larger scale showin the edge of acollar with its reinforcing acket.

by the line 3-3 in Fig. 1.

Fig. 4 is a section on an enlarged scale showing the lead ring after ithas been sli htly compressed, and

ig. 5 is an elevation partly in section of a string of pipe equippedwith the invention.

In these drawings, a string of pipe consisting of joints of pipe11,,secured together by collars 12, is shown. vided with threads 13 oneither end, these threads engaging the collars 12 as best shown inFig. 1. The collars 12 tend to wear rapidly, due to their being turnedin the ground and bearing on the rock, sand, or other naturalformations, through which the well passes. When these collars becomeworn they are removed from the pipe 11 and are turned down so that theoutside is concentric with the bore. A jacket 14 is then bored outsomewhat smaller than the exterior of the collar 12. The jacket 14 isthen heated so that it can be placed over the collar 12, shrinkingthereon as it cools. The collar 12 has its end slightly chamfered, andthe jacket 14 is peened down as shown in Fig. 2 over the bevel 15, sothat the acket 14 cannot come oil the collar 12.

For the purpose of preventing the collar from bursting, a lead ring 20is placed inside the collar 12 between the ends of pipe 11. Whenever anexcessive strain comes on the pipe the lead in the ring 20 flowsslightly, thereby allowing the pipes 11 to turn with relation to eachother and relievin the strain.

The method of operation has been explained in the above description.

I claim as my invention 1. The method of reconstructing worn pipecollars which com rises turning down the collar to an even t ickness andshrinking a jacket thereon.

2. The method of reconstructmg worn pipe collars which comprises turningdown the collar to an even thickness shrinking a jacket thereon, andupsetting the end of the acket to prevent axial movement of the jacketonthe collar.

In testimony whereof, I have hereunto set my hand at Los Angeles,California, this 21st day of April, 191

HUGH A. BARDEEN.

